Describe the principle of working of deflection magnetometer. Explain how the magnetic moments of two short bar magnets can be compared in tan A position by Equal distance method

The ratio of the magnetic fields due to small bar magnet in end position an broad side on position is (at equal distance from the magnet)

The ratio of the magnetic fields due to small bar magnet in end position and on broad side position is (at equal distance from the magnet)

The needle of a deflection galvanometer shows a deflection of 60^(@) due to a short bar magnet at a certain distance in tan A position. If the distance is doubled, the deflection is

The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio.

Two short magnet having magnetic moment in the ratio 27:8 , when placed on the opposite sides of a deflection magnetometer, produce no deflection. If the distance of the weaker magnet is 0.12m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is

The time period of the magnetic in an oscillation pmagnetometer in the earth magnetic field is 2s. A short bar magnet is placed to the north of the magnetometer, at a separation 10cm from the oscillation magnet, with its north pole pointing towards north. The time period beceomes half. Calculate the magnetic moment of this short magnet.

The tangents deflection produced in tan A and B positions by a short magnet at equal distances are in the ratio .

A deflection magnetometer is placed with its arm along the east-west direction (tan A position) and a short bar magnet is placed symmetrically along its axis at some distance with its north pole pointing towards east. In this position the needle of the magnetometer shows a deflection of 60^(@) . If we double the distance of the bar magnet, then the deflection will be

The needle of a deflection magnetometer deflects through 45^@ from north to south when the instrument is used in Tan-A position with a magnet of length 10cm placed at a distance of 25cm. (a) Find the magnetic moment of the magnet if the earth's horizontal magnetic field is 20 muT . (b) If the magnetometer is used in Tan-B position with the same magnet at the same separation from the needle, what will be the deflection?

Describe the working principle of a moving coil galvanometer. Why is necessary to use (i) a radial magnetic field and (ii) a cylindrical soft iron core in a galvanometer ? Write the expression for current sensitivity of the galvanometer . Can a galvanometer as such be used for measuring the current ? Explain.